UncompressedDecompressor.cpp

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/*
    RawSpeed - RAW file decoder.
 
    Copyright (C) 2023 Roman Lebedev
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
 
#include "decompressors/UncompressedDecompressor.h"
#include "MemorySanitizer.h"
#include "adt/Casts.h"
#include "adt/Point.h"
#include "bitstreams/BitStreams.h"
#include "common/RawImage.h"
#include "common/RawspeedException.h"
#include "fuzz/Common.h"
#include "io/Buffer.h"
#include "io/ByteStream.h"
#include "io/Endianness.h"
#include <cassert>
#include <cstddef>
#include <cstdint>
 
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size);
 
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {
  assert(Data);
 
  try {
    const rawspeed::Buffer b(
        Data, rawspeed::implicit_cast<rawspeed::Buffer::size_type>(Size));
    const rawspeed::DataBuffer db(b, rawspeed::Endianness::little);
    rawspeed::ByteStream bs(db);
 
    rawspeed::RawImage mRaw(CreateRawImage(bs));
 
    int inputPitchBytes = bs.getI32();
    int bitPerPixel = bs.getI32();
    rawspeed::BitOrder order = [&bs]() {
      switch (int val = bs.getI32()) {
      case static_cast<int>(rawspeed::BitOrder::LSB):
      case static_cast<int>(rawspeed::BitOrder::MSB):
      case static_cast<int>(rawspeed::BitOrder::MSB16):
      case static_cast<int>(rawspeed::BitOrder::MSB32):
      case static_cast<int>(rawspeed::BitOrder::JPEG):
        return rawspeed::BitOrder(val);
      default:
        ThrowRSE("Unknown bit order: %i", val);
      }
      __builtin_unreachable();
    }();
 
    rawspeed::UncompressedDecompressor d(
        bs.getSubStream(/*offset=*/0), mRaw,
        rawspeed::iRectangle2D({0, 0}, mRaw->dim), inputPitchBytes, bitPerPixel,
        order);
    mRaw->createData();
    d.readUncompressedRaw();
 
    rawspeed::MSan::CheckMemIsInitialized(
        mRaw->getByteDataAsUncroppedArray2DRef());
  } catch (const rawspeed::RawspeedException&) { // NOLINT(bugprone-empty-catch)
    // Exceptions are good, crashes are bad.
  }
 
  return 0;
}